3M™ Particulate Filter 2138, GP2/GP3, with Nuisance Level Organic Vapour/Acid Gas Relief (Pair)Provides protection against: Particulates (P2 P3*), Ozone and Nuisance Level** Acid Gas & Organic Vapours with Low Vapour Pressure. * Higher P3 protection factors only achieved with a 3M Full Face Respirator, otherwise P2 protection level when worn on a 3M Half Face Respirator. **Nuisance Levels are those levels below the Workplace Exposure Standard (WES). Protection Factors Note that any filtering respirator should not be used for protection at